Syringe



May" 8, 1934- w. 1. CARPENTER SYRINGE Filed Nov. 15, 1950 2 Sheets-Sheet 1 INVENTOR. fl sier L Cmyoerzier ATTORNEY.

Patented May 8, 1934 UNITED STATES PATENT OFFICE 16 Claims.

This invention relates to a syringe particularly adapted for use as a dental syringe, and has for its primary object to provide, in a manner as hereinafter set forth, a syringe of such class which is I provided with an extremely sensitive valve control in order that the rate of discharge from the syringe may be accurately gauged from a stream under full pressure to a succession of intermittent drops.

A further object of the invention is to provide a syringe having a sensitive valve control as aforesaid, which may be used in connection with a source of warm fluid supply without any appreciable lowering of the fluid temperature within the syringe during such intervals as the valve may be closed, thereby maintaining the syringe available for instant use at spaced intervals.

A further object of the invention is. to provide a syringe of the character aforesaid which is of exceedingly simple and inexpensive construction,

and which is capable of long use without deterioration.

With the foregoing and other objects in view, the invention consists of the novel construction, combination and arrangement of parts as hereinafter more particularly described, and as illustrated in the accompanying drawings wherein is shown an embodiment of the invention, but it is to be understood that the description and drawings are to be taken as illustrative and that the invention is intended to be limited only by the scope of the claims hereunto appended.

In the accompanying drawings in which like numerals are employed to designate like parts throughout the several views:

Figure 1 is a side elevation of a syringe in accordance with this invention.

Figure 2 is a front elevation thereof.

Figure 3 is a rear elevation thereof.

Figure 4 is an enlarged longitudinal section through the syringe.

Figure 5 is a section taken at a point indicated by the line 5-5 of Figure 4.

Figure 6 is a section taken at a point indicated by the lines 6-6 of Figure 4.

Figure '7 is a section taken at a point indicated by the line 7-7 of Figure 4.

Figure 8 is a perspective view of the valve forming a part of the syringe.

Figure 9 is a top plan of one of the valve control elements.

Referring to the drawings in detail, the numeral 1 indicates a handle member of tubular construction which is adapted to have a hose, such as 2, inserted into one end thereof. Preferably the hose 2 will be provided with a heating element, such as 3. The hose 2 is connected at its inner end to a hollow coupling 4 through which the heating element 3 extends.

Connected with the handle member 1 and coupling member 4 is a hollow body portion 5, the interior of which provides a fluid chamber 6. Communicating with the fluid chamber 6, and opening through the wall of the body portion 5, is an opening 7. Concentrically of the opening '7, the body portion 5 is formed with an internally and externally threaded annulus 8 with which the handle member 1 and coupling member 4 are threadedly engaged. The heating element 3 extends through the opening 7 and terminates with its inner end disposed within the chamber 6.

At right angles to the opening '7, the body portion 5 is formed with a threaded opening 9 for connection with an elongated nipple 10 formed with a longitudinally extending fluid chamber 11 in communication with the fluid chamber 6. Intermediate the ends of the nipple 10, the chamber 11 is formed with an inwardly tapering wall 12 whereby the chamber 11 is provided with a reduced area at the outer end thereof. Opening into the reduced area portion of the chamber 11 is a fluid passage 13 which extends longitudinally of the nipple 10 and opens through the outer end thereof. The outer end portion of the nipple 10 is of tapered formation and of materially reduced diameter as indicated at 14. At the inner end of the portion 14 the nipple is formed with a shoulder having a pair of pins 15 projecting radially therefrom. The outer end of the portion 14 is disposed within a tapered socket at one end of a syringe tip 16 which is provided with a fluid passage 17 in communication with the fluid passage 13. The tip 16 is coupled to the portion 14 by means of a sleeve 18 having an inturned end portion 19 encircling the tip and having its opposite end formed with angular recesses 20 for engagement with the pins 15. Disposed within the sleeve 18, and encircling a portion of the tip 16, is a spring 21, the respective ends of which abut against the inturned end 19 of the sleeve and against a shoulder 22 formed at the inner end of the tip 16. The action of the spring 21 exerts a force on the tip towards the gurtion 14 and maintains the pins 15 in engagement with the walls of the recesses 20. In order to provide a smoothly rotatable, leak proof connection between the nipple 10 and tip 16, the portion 14 is formed with a plurality of spaced, circumferentially extending grooves 14', and the portion 14 is wrapped with a suitable packing 15' for engagement with the wall of the socket in the tip 16. A portion of the packing extends into the grooves 14' whereby the packing is held in position.

Extending through the rear wall 23 of the fluid chamber 6 is a valve stem 24 which is provided at its forward end with a cup 25 to which is secured a resilient valve plug 26. Encircling the stem 24, and having its respective ends bearing against the wall 23 and cup 25, is a coiled spring 2'7 which normally maintains the resilient plug 26 in engagement with the tapered wall 12 which provides a valve seat for the plug. Encircling the valve stem 24, rearwardly of the wall 23, is

a suitable packing'28 which is maintained in position by means of a gland nut 29 in threaded engagement with a threaded opening 30 in alignment with the opening 9. Threaded on the outer end of the valve stem 24 is a valve control nut 31 and a lock nut 32. The nuts 31 and 32 preferably are adjusted in a manner to seat the forward end .of the nut against the rearward face of the gland nut 29 when the plug 26 is seated against the tapered wall 12. Between the openings '7, 9 and 30, the body portion 5 is formed with a spaced double wall to provide insulating spaces 33 for the fluid chamber 6. The portion of the nipple 10 encircling the fluid chamber 11 is also provided with a double wall to form an insulating space 34 for the fluid chamber 11.

Projecting from the body portion 5 is a lug 35 to which is pivotally connected an arm 36 formed integrally with a valve control element 37 which is adapted to be operated by the thumb of the operator. The member 37 extends substantially in parallel relation to the handle member 1 and is provided at its inner end with a slot 38 through which a central portion of the controlling nut 31 extends. The controlling nut 31 is formed at its rearward end with a flange 39 against which the inner end of the control member 37 abuts.

Secured to the handle member 1, adjacent the outer end thereof, is a clamp 40 to which is secured a valve control element indicated generally at 41 and adapted to be controlled by the fingers of the operator. The valve control member 41 includes an elongated, substantially semicylindrical body portion 42 extending longitudinally of the handle member 1 in spaced relation thereto. The elongated body portion 42 is formed at its inner end with a slotted, substantially cup-like portion 43 which provides a seat for the body portion 5. Projecting from the rearward side of the cup portion 43 is a neck 44 formed with an upturned lug 45 hearing against the forward face of the flange 39 on the controlling nut 31. Projecting forwardly from the cup-like portion 43 is a concave extension 46 which provides a seat for the rearward end portion of the nipple-10.

In the operation of the syringe, the latter is grasped in a manner to extend the fingers of the operator around the elongated body portion 42 of the controlling element 41, and to position the thumb against the rear face of the controlling element 37, adjacent the outer end of the latter. By the exertion of a squeezing motion with the hand, the controlling elements 37 and 41 will be swung about their pivots simultaneously whereby the inner end of the element 3'7 and the lug 45 of the element 41 will be pressed against the forward face of the flange 39 to force the latter rearwardly carrying the valve stem 24 therewith and removing the plug 26 from its seat' on the tapered wall 12. Owing to the action of the valve control elements 37 and 41 on the controlling nut 31 simultaneously, the rearward pressure on the latter may be accurately gauged in order to only slightly space the plug 26 from the wall 12 if desired. Owing to the fact that the valve is controlled by the entire hand of the operator, there is no tendency of nervousness of the hand, thereby enabling the operator to accurately and steadily maintain the plug 26 at the desired distance from its seat on the wall 12. Owing to the insulating spaces 33 and 34 for the fluid chambers 6 and 11, the valve may be closed for relatively long periods without any appreciable lowering of temperature of the fluid within the chambers 6 and 11. i

It is thought that the many advantages of a syringe in accordance with this invention may be readily apparent, and although the preferred embodiment of the invention is as illustrated and described, it is to be understood that changes in the size, shape and arrangement of parts may be resorted to, so long as such changes fall within the scope of the invention as defined in the appended claims.

What I claim is:-

1. A syringe comprising, a hollow body portion providing a fluid chamber having an inlet and an outlet, a handle member projecting from the body portion in concentric relation to the inlet, a valve normally closing the outlet and including a stem projecting from the body portion, a control nut secured to the stem externally of the body portion, and means engaging said control nut and operable by a squeezing motion of the thumb and fingers of the hand' for opening said valve, said means including an elongated, finger controlled element pivotally' connected with said handle member and extending longitudinally thereof, said elongated element havinga rearward extension bearing against the inner face of said control nut.

2. A syringe comprising, a hollow body portion providing a fluid chamber having an inlet and an outlet, a handle member projecting from the body portion in concentric relation to the inlet, a valve normally closingthe outlet and including a stem projecting from the body portion, a control nut secured to the stem externally of the body portion, and means engaging said control nut and operable by a squeezing motion of the thumb and fingers of the hand for opening said valve, said body portion being formed with a double wall providing an air space between the inlet, outlet and projection portion of the valve stem.

3. A syringe comprising, a hollow body portion, a hollow nipple connected with the body portion and coacting therewith to provide a fluid chamber having an inlet and an outlet, said fluid chamber having a tapered wall adjacent the outlet, a handle member projecting from the body portion in concentric relationto the inlet, a valve normally closing the outlet, said valve including a stem projecting from the body portion and further including a resilient plug for engagement with said tapered wall, a control nut secured to the valve stem externally of the body portion, and means engaging said control nut and operable by a squeezing motion of. the thumb and fingers of the hand for opening said valve.

4. In combination, a syringe comprising a body having a fluid chamber provided with an inlet and an outlet, a valve arranged to control said outlet, a fluid conveying tube connected with and opening directly into said inlet, and a fluid warming element within said tube and extending through said inlet into said fluid chamber.

5. In combination, a syringe comprising a body having a fluid chamber provided with an inlet and an outlet, and a fluid conveying tube opening into said inlet and provided therein with an electrically actuated fluid warming element extended through said inlet and projecting into and terminating in said fluid chamber.

6. In combination, a syririge comprising a structure provided with a fluid chamber and formed with a tubular extension serving as a handle, said chamber provided with an inlet and an outlet, a valve arranged to control said outlet, and a fluid conveying tube extended through said handle and opening into said inlet, and an electrically actuated fluid warming element extended through said tube and inlet and projecting into and terminating in said fluid chamber.

7. In combination, a syringe comprising a body having a fluid chamber provided with an inlet and a closely associated outlet, a valve. arranged to control said outlet, a fluid conveying tube connected with said inlet and having a fluid warming element arranged therein and projecting therefrom into said fluid'chamber in close proximity to said outlet.

8. A warm fluid syringe having a flexible supply tube connected therewith and comprising, a body portion adapted to serve as a handle provided'with a chamber through which the fluid passes, and a heating element extended through the tube andterminating in said chamber.

9. A syringe having a flexible fluid supply tube connected therewith and comprising a body portion serving as a handle and including a chamber, and a heating element extending through said tube and terminating in said chamber.

10. A syringe comprising, a body part of a form to provide a handle and formed with a fluid receiving chamber, and a fluid heating element arranged in said body part and extended into said chamber.

11. A syringe comprising, a body part adapted to serve as a handle for the syringe and formed with a fluid receiving chamber, a fluid conduit opening into said chamber, said body part formed with a fluid outlet, a controllable closure means for said outlet, and a fluid heating element passing through said conduit and extending into said chamber to a point in proximity to said outlet.

12. A syringe comprising a body part adapted to serve as a handle for the syringe and provided with a fluid receiving chamber having an outlet, a fluid conducting means opening into said chamber in proximity to said outlet, a controllable closure means for said outlet, and a fluid heating element extending through said conducting means and extended into said chamber in proximity to said outlet.

13. A syringe having a flexible fluid supply line connected therewith and comprising, a body por tion serving as a handle for the syringe and including a fluid receiving chamber, and a heating element positioned in the line and chamber for heating the fluid when passing through the line and for heating the fluid within the chamber.

14. A syringe comprising a body part adapted to serve as a handle for the syringe and formed at one end with a fluid receiving chamber having a controllable outlet, means providing a fluid conduit opening at its inner end into said chamber, and a fluid heating element arranged within said conduit and extending from the inner end of the latter into said chamber.

15. A syringe comprising a body part adapted to serve as a handle and formed with a fluid receiving chamber having a controllable outlet, said chamber having an opening, a tubular coupling registering with said opening, a flexible fluid supply line attached to said coupling, and a fluid heating element arranged in said line, said element being extended from the line through said coupling and having a portion thereof within said chamber.

16. A syringe comprising a body part formed with a fluid receiving chamber having an outlet, said chamber being formed with anopening, a fluid supply conduit registering with the latter, and a fluid heating element within said conduit extended from the latter and through said opening and having a part thereof arranged in said chamber.

WEBSTER I. CARPENTER. 

